Combined wave-changer and wave-meter



COMBINED WAVE CHANGER AND WAVE METER.

APPLICATION FILED ocT. 7. 1918.

1,338,984, Patented May 4, 1920.

Source of sit 0W "VZZ TED STATES PATENT -orFIcE.

GUY HILL, OF WASHINGTON, DISTRICT OF COLUMBIA.

COMBINED WAVE-CHANGER AND WAVE-METER.

To all whom it may concern:

Be it known that I, GUY HILL, a citizen of the United States, and a resident of Washington, District of Columbia, have invented certain new and useful Improvemerits in Combined Wave-Ghangers and,

l Vave-Meters, of which the following is a specification accompanied by drawings.

This invention relates to radio signaling apparatus, but more particularly to wave changing devices and the primary object of the invention is to provide operative means connection with the wave changer for positively determining wave lengths. To this end the apparatus embodies a wave changer and wdvemeter combined in a unitary structure having common means for simultaneously adjusting both the wave changer and the wavemeter.

in radio transmitting sets, such as are sets, where coupled circuits are not employed, impact sets, and certain forms of two-audios sets where the radiated wave -length depends upon the constants of the antenna circuit and not upon the constants of the primary method of summing the wave length transmitt-ed after the set is oncetuned and ad yusted, in case the constants of the antenna are changed; that is, if the set was adjusted to a fixed antenna and this antenna became destroyed, and a new antenna of diiferent constants had to he used, the operator could in no way determine the wave length beingtransmitted, unless he was provided with a wavemeter. r

if such a set includes a \vavemeter, which is a separate piece of apparatus, such an instrument might easily be removed fromthe set, and if the transmitting set were on shiphoard the wavemeter could easily be left ashore, or in some inaccessible place, so that in case of emergency the operator might have no method of knowing thewave length he was using.

The present invention overcomes the above difficulties by having a wavemeter built into the transmitting set and forming an integral part of the transmitting equipment, and pled to thetransmitter that when the wave length is changed the wavemeter is also adjusted. to prevent the operator setting his wave-changing switch on one wave length and his wavemeter on another, and thereby cause confusion.

Specification of Letters Patent.

circuit, the operator has no in addition so mechanically couon antenna A,

Patented May 4, 1920.

Application filed October 7, 1918, Serial No. 257,182.

slider clips 6 connected to contact studs a,

b, c and A wave changing switch arm D connected to shaft E is adapted to sweep over and make successive contact with studs (1", I), c and d for varying the loading inductance.

Arm D is connected to ground at E 70 through a suitable source of supply F of high frequency oscillations which may be an arc generator, and for'thepurposes of this invention, the source of supply F is merelyindicated conventionally, it being 76 understood that any other desired apparatus instead of an arc may be used. Theinvention may be applied to a quenched spark set, for instance, and the leads f and 9 shown in connection with the conventional 8) device indicated by the letter F may lead to a primary circuit or to a source of supply of high frequency oscillations. The wavemeter P, together with its 0011- trolling devices and connections, is prefer- 85. ably adapted to be built into the transmitting set and forms a part thereof and of the wave changer, so that the wave changer'and I wavemeter become an auxiliary unit. A single loop G is inserted in the antenna to circuit and the wavemeter circuit includes a similar loop H, inductively coupled to loop G; an ammeter or indicating instrument J, a condenser K'and an inductance L, provided with slider clips 6 connected to contact studs it and k respectivel on wavemeter panel M. A switch arm carried by shaft E-co6perates with contacts h, i, j and 7 for varying inductance L. A handle 0 on shaft E provides means for operating the meter switch N and transmitter inductance switch D simultaneously. The drawing represents circuits and C0117 nections for four different wave lengths;- for example, 300, 600', 900 and 1200 meters,

beginning with the shortestand N are on c'on- -The amount of i section a for the:

wave length when arms D tacts'o. and h respectively. inductance in loading coil shortest wave will be adjusted by its clip 6 and a similar adjustment is made on inductance L sothat the wavemeter circuit 1 d on transmitter switch panel C. 65

slider 11!) is in resonance for the desired wave length when the antenna circuit 1s accurately tuned to the same Wave length.

tune the set for a difierent After the set is once installed and the Wavemeter P calibrated, the operator has but one handle 0 for manipulation in making adjustments for change of wave length. The provision of common operative means between switches D and N prevents the operator through carelessness or in time of excitement, from setting his wave changing switch arm D on contact 6 for instance, and his wavemeter arm N on the wrong contact, as contact h, and then attemptingto tune the set by means of the wavemeter P, in which case he would believe he was sendingon one wave length but might, actually wave length.

I claim and desire to obtain by Letters Patent, the following:

1. In a radio transmitting set, a unitary structure for simultaneously changing and automatically measuring wave lengths, comprising in combination with an antenna and variable loading inductance, of a wavemeter built into the said transmitting set and forming anintegral part of the same, said wavemeter being coupled to the antenna and including a variable inductance, a wave changing switch for controlling the antenna loadin ind" ctance,

- contro ling the variable Wavemeter inductance, and common means actuating both sad-switches for adjusting for simultaneously a wavemeter switch for built into the said transmitting set and, same, said forming an integral part of the wavemeter being coupled to the antenna and including a variable inductance, adjustable contacts and contact studs for both the loading inductanceand wavemeter inductance,

switches cooperating with the'contact studs 0- controllin' both of said variable in duct-ances, an common means for simultaneously actuating both said switches for adjusting the loading inductance and the wavemeter inductance, whereby the wavemeter circuit is automaticallybrought into resonance for the desired wave length when the antenna is tuned to the same wave length. In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

GUY HILL. I

Witnesses:

HERBERT G. OGDEN, M. H. PAYNE. 

